[Home](./index.md) > [@firebase/database](./database.md) > [Database](./database.database.md) > [useEmulator](./database.database.useemulator.md) ## Database.useEmulator() method Signature: ```typescript useEmulator(host: string, port: number): void; ``` ## Parameters | Parameter | Type | Description | | --- | --- | --- | | host | string | | | port | number | | Returns: void